Data Translation DT9820 Series, User Manual

Page: 72 / 112

Chapter 5
60
Calibrating the Analog Output Subsystem
To calibrate the analog output circuitry of the DT9822 function
module, use an external precision meter available from vendors such
as Fluke, then perform the following steps:
1. Connect Analog Output 0 (TB3, 3) to the positive side of the
precision voltage meter.
2. Connect Analog Ground from the return of the analog output
signal (TB3, 2) to the negative side of the precision voltage meter.
3. In the DAC0 Voltage box, click 0.000 V.
4. In the DAC0 Adjustment box, click the increment or decrement
arrows until your external meter display reads 0 V (within
0.0005 V).
5. In the DAC0 Voltage box, click +9.375 V and verify that your
external meter display reads +9.375 V (within ±12 mV.)
6. Connect Analog Output 1+ (TB3, 4) to the positive side of the
precision voltage meter.
7. Connect Analog Ground from the return of the analog output
signal (TB3, 2) to the negative side of the precision voltage meter.
8. In the DAC1 Voltage box, click 0.000 V.
9. In the DAC1 Adjustment box, click the increment or decrement
arrows until your external meter display reads 0 V (within
0.0005 V).
10. In the DAC1 Voltage box, click +9.375 V and verify that your
external meter display reads +9.375 V (within ±12 mV.)
Note: If you are not satisfied with the analog output calibration,
you can load the factory default settings stored in the EEPROM by
clicking Restore in the D/A Calibration Factory Settings box.